20 janv. 1968 - Reg Dwight and Caleb Quaye leave Bluesology

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http://eltonjohnscorporation.blogspot.co.uk/2012/11/elton-johns-diary-1968.html puts it as a Scotland show in May 1968.
Also, http://eltonjohnscorporation.blogspot.co.uk/2012/11/elton-johns-diary-1967.html says it was December 1967, ahd this is when he invented EJ persona.
Mecca, Basildon (22 March 1968) has been mentioned as well.